Roberta Williams had some influence (though how much is unknown) and praised the books, as well as supplied to the author about the games stories.
[4] In The King's Quest Companion, Spear claims that the World of Daventry exists in a different plane of reality.
Spear even suggests that the Eye can be seen in the actual King's Quest III game, pointing out an object on the bookshelf in Manannan's study that looks like a computer screen.
Peter Spear worked directly with Jane Jensen while editing and writing material for KQ6 portions (the main novelization was written by the professional novelist eluki bes shahar), and he worked with Lorelei Shannon on the material published in the 4th Edition and King's Quest VII: Authorized Guide.
Other people at Sierra that assisted with Peter Spear in developing the book through the years include Bill Davis, Dennis Jonathan, Kirk Green, Anita Greene, Liz Jacobs, Mark Seibert, Marc Hudgins, Jonk Meek, Dan Rogers, Jerry Bowerman, and Joe Escalle.
The author directly worked with designers and the game publisher to receive behind the scenes information, and influenced material in the games (About King's Quest I-V), the manuals and even other official Hint Books on occasion (see KQ6 and KQ7 hintbooks by Lorelei Shannon, KQ5 Manual (computer and NES versions), the Guidebook to the Land of the Green Isles, KQ6 itself, and King's Questions (a computer game), and other material in the King's Quest Collection (15th Anniversary Collector's Edition)) (The Royal Scribe).
Sierra's Interaction Magazine, and King's Quest Collection reprinted portions of the book on occasion to advertise them, give background story to the King's Quest World, and give hints to players (Sierra Magazine, Autumn 1989, Interaction, Fall 1994).